3B2 Ch 7

Question 1

The benefits of a combined cycle with a single-shaft gas/steam turbine arrangement include which of the following?
1. High level of thermal efficiency
2. Low capital cost
3. Fast start-up and shutdown
4. Short construction time
5. Low maintenance cost
Select one:

a.
1, 2, 3

b.
1, 2, 4

c.
1, 3, 4

d.
1, 2, 3, 4

e.
1, 2, 3, 4, 5

Answer 1

e.
1, 2, 3, 4, 5

Question 2

B2C07Q03 A single-shaft combined-cycle plant _________________.
Select one:

a.
Has higher maintenance costs

b.
Requires a more costly enclosure

c.
Is more costly to build

d.
Requires a synchronous self-shifting coupling

Answer 2

b.
Requires a more costly enclosure

Question 3

During low thermal requirement periods of a cogeneration system, what does a diverter valve direct?
Select one:

a.
Exhaust gases from the HRSG to the atmosphere

b.
Thermal energy from the duct burner to the atmosphere

c.
Excess electrical energy to another utility grid

d.
Thermal energy from the gas turbine to the duct burner

e.
Exhaust gases from the gas turbine to the atmosphere

Answer 3

e.
Exhaust gases from the gas turbine to the atmosphere

Question 4

B2C07Q01 The efficiency of a simple cycle plant approaches what percentage?
Select one:

a.
60%

b.
70%

c.
80%

d.
40%

Answer 4

d.
40%